NATURE 3

1. The highest point of a hill or mountain.
5. Wet, low-lying land that is flooded in wet seasons or at high tide, and typically remains waterlogged at all times.
6. A stretch of salt water separated from the sea by a low sandbank or coral reef.
8. A small picturesque cave, especially an artificial one in a park or garden
10. A dense group of bushes or trees.
11. A deep gorge, typically one with a river flowing through it.
13. A body of permeable rock that can contain or transmit groundwater
14. A bowl-shaped depression formed by the impact of a meteorite, volcanic activity, or an explosion.
15. An area of relatively level high ground.
17. A barren area of landscape where little precipitation occurs and, consequently, living conditions are hostile for plant and animal life.
18. A fertile spot in a desert where water is found.

2. A mobile, destructive vortex of violently rotating winds having the appearance of a funnel-shaped cloud.
3. A biological community of interacting organisms and their physical environment.
4. A prolonged period of abnormally low rainfall, leading to a shortage of water.
7. A mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust.
9. A long high sea wave caused by an earthquake, submarine landslide, or other disturbance.
12. A triangular tract of sediment deposited at the mouth of a river, typically where it diverges into several outlets.
13. A mass of snow, ice, and rocks sliding swiftly down a mountainside.
16. A hot spring in which water intermittently boils, sending a tall column of water and steam into the air.